Wrench.



JOHN G. SIMPSON, OI MOUNDSVILLE, -VEST VIRGINIA.

WEE 1d G111.

Specification oi Letters Patent.

Patented Jan. 5, 1909.

Application filed April 21, 1908. Serial No. $28,389.

To all whom it may concern:

Be it known that I, JOHN C. SIMPSON, citizen of the United States,residing at Moundsville, in the county of Marshall and State of VestVirginia, have invented certain new and useful improvements in renches,of which the following is a specification.

The object of this invention is an improved wrench which is arranged tobe quickly, conveniently and positively operated by the movement of thehandle in one direction to effectually grip the work, and in the otherdirection to release the same, which will automatically adjust itself tothe size of the work, and which is particularly adapted for use withnuts, pipes or other work of that character.

lltith this and other objects in view that will more fully appear as thedescription proceeds, the invention consists in certain constructionsand arrangements of the parts that I shall hereinafter fully describeand then point out the novel features thereof, in

the appended claims.

For a full understanding of the invention and the merits thereof, and toacquire a knowledge of the details of construction, reference is to behad to the following description and accompanying drawing, in which:

Figure l is a plan view showing one ei1- bodiment of the invention; Fig.2 is a similar view illustrating another embodiment thereof; and, Fig. 3is a section on the line 33 of Fig. 1.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawing, by he samereference characters.

My improved wrench embodies a handle 1 that may be of any desiredconstruction or design, and which is pivoted near its forward end, asindicated at 2, to one end of a bar 3. This bar 8 carries two arms 4:that are ranged to cross at a point intermediate of their ends, andwhich are pivoted together at such point and to the other end of the bar3, indicated at 5, the contacting faces of the arms beingcorrespondingly recessed near their pivotal connection, as indicated at6, so as to permit the arms to operate in the same plane. The forwardends of these arms constitute jaws 7, while the rear ends of the armsare preferably angnlarly disposed so as to extend rearwardly parallel tothe handle 1 when the jaws are closed, and are connected to said handleby means of two links 10 which are pivoted at one end to the rear endsof the respective arms, and the other ends of which are pivotallyconnected to the handle, one in front of and one behind ihe pivotalpoint 2. By this construction, there is provided between the rear endsof the arms a toggle mechanism, of which the handle forms a part, sothat upon the movement of the handle to the right, the links 10 arespread apart, thus spreading the ends of the arms and effecting theopening of the aws.

In the practical use of my improved wrench, the handle 1 is moved toopen the jaws T, to embrace the work, the handle being then moved to theleft, which obviously closes the jaws with great force, and causes themto clamp the work, the continued movement of the handle to effect therotation of the work, causing said aws to grip the work more firmly.

in the form of the device designed for use with nuts, the opposing edgesof the jaws 7 are correspoi'idingly notched, as indicated at 5, while inanother form of the invention arranged for use with pipe work, the jawsare curved outwardly, as shown, so that their forward extremities willabut against each other, when the jaws are closed, the inner edges ofthe jaws being preferably serrated, as indicated at 9, and the abuttingedges being notched, as shown at 9. hen the wrench used to rotate a nut,the extremities of the aws T are closed about the same, so that the nutis received in the corresponding recesses 8. When it is desired torotate the work in the opposite direction, the wrench is turned over andoperated substantially as before described.

From the above description, in connection with the ace panying drawing,it will be apparent that have provided a simple, durable and efiicientconstruction of wrench which may be conveniently and positively operatedby the movement of the handle, to cause the jaws to forcibly grip thework or quickly release the same.

Having thus described the invention, what I claim is:

l. A wrench comprising a handle, a bar pivotally connected to thehandle, arms crossing at an intermediate point and pivoted at such pointto the bar, the forward ends of such arms constituting jaws, and atoggleanechanism between the rear ends of the arms and of which thehandle forms a part.

2. A wrench comprising a handle, a bar pivotally connected to thehandle, arms crossing at an intermediate point and pivoted at such pointto the bar, the forward ends of such arms constituting jaws, and linkspivotally connected to the rear ends of the arms and to the handle andcooperating with the latter to form a toggle mechanism.

3. A wrench comprising a handle, a bar pivotally connected at one end tothe handle, 1 1S crossing at an intermediate point and pivotallyconnected at such point to the other end of the bar, the forward ends ofsaid arms constituting jaws, and links pivotally connected to the rearends of the arms and having their other ends pivoted to the handle, onein front of and one behind the pivotal connection of the handle to thebar. 4:. A Wrench comprising a handle crossed arms pivotally connectedtogether and constituting jaws, means for connecting the handle to thecommon pivot point of the arms, and a toggle mechanism interposedbetween the arms and of Which the handle forms a part.

In testimony whereof I affix my signature in presence of two Witnesses.

JOHN C. SIMPSON. [L. s] lVitnesses W. G. MCGLUMPHY, W'. D. STEVARTL

